Stop-motion for looms.



0. A. SAWYER.

STOP MOTION FOR LOOMSI APPLICATION FILED 313.13, 1909.

938,712. Patented Nov. 2, 1909.

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O. A. SAWYER. STOP MOTION FOR LOOMS. APPLICATION 111mm PEB.13, 1909.

938,71 2. Patented Nov. 2, 1909.

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ORREN A. SAWYER, OF LOWELL, MASSACHUSETTS, ASSIGNOR TO EARL A. THISSELL,

' OF LOWELL, MASSACHUSETTS.

STOP-MOTION FOR LOOMS.

Specification of Letters Patent.

Application filed February 13, 1909.

Patented Nov. 2, 1909.

Serial No. 477,503.

To all whom it may concern:

Be it known that I, ORREN A. SAWYER, a citizen of the United States,residing at Lowell, in the county of Middlesex and Commonwealth ofMassachusetts, have invented a certain new and useful Improvement inStop-Motions for Looms, of which the following is a specification.

This invention relates to looms of that class which are known as plainlooms, in which the filling supply is renewed by hand by removing theempty shuttle and inserting a shuttle with a full bobbin or cop and theobject of said invention is to stop the loom before the filling isexhausted, in order that the last pick or stretch of filling may extendentirely across the cloth, to avoid the necessity of removing thedeficient pick in goods of the better quality. Such looms, by means of astop-motion mechanism controlled by a stop-motion fork or filling-fork,are usually automatically stopped when the filling breaks or isexhausted, but usually the last pick or stretch of filling does notextend across the cloth and must be removed by hand and a newfilling-thread substituted therefor, that is, in either case the shuttlemust be taken out and the same shuttle or a new shuttle containingfilling must be introduced at the side of the loom where the deficientpick commenced. In either case, unless the work is of the simplest kindas two harness work, the loom must be turned over or worked by handwithout filling until the harnesses are in the same position, as at thebeginning of the defective pick, before the defective pick can bereplaced. Failure to find the proper pick before re-starting would causean obvious clefect in figured or napped goods.

In the accompanying drawing, on two sheets, Figure 1 is a plan of suchparts of a plain loom provided with my invention as are required for theunderstanding of the following description; Fig. 2, a vertical sectionof the same on the line 2 2 in Fig. 1; Fig. 3, an enlarged sideelevation of the tilting hook, the weft-fork and adjacent 00- operatingparts; Fig. 4, a plan of a shuttle 0 having means for producing anincreased tension on the filling when the same is nearly exhausted.

The frame A; breast-beam a lay B; reed D; reed-cap d; cam-shaft X,carrying a cam 00, the weft-hammer IN; the weft-fork o pivoted on theslide V; the stop-motion rod U; the shipper or stopping and startinglever F; the notched plate a, which holds the shipper in position whenthe loom is running, are of any usual construction and operation exceptas hereinafter stated.

. The weft-fork o is provided with a hook c at its front end which isnormally held out of the path of the upper end of the wefthammer IV assaid upper end swings forward, by the pressure of the filling on therear end of of said fork but when said filling is broken, exhausted ortoo slack, said hook 'v falls and is carried forward with the slide V bysaid weft-hammer and rocks the stop-motion rod U, to the upper arm a ofwhich said slide is connected, causing the lower arm a of said rod U topress the shipper F out of the notch in the holdingplate a, whereuponthe Shipper is thrown by a spring not shown, in such a manner as to stopthe loom in a well-known manner.

The fork o in this invention besides being operated by a failure orslackness of the filling is operated by an excessive tension of thefilling to lift its front or hooked end '0 high enough (see Fig. 8) tostrike and lift the rear arm of a tilting hook E which is fulcrumed at con the upper arm t of a lever T, said arm t reaching up over thebreast-beam a as shown, depressing the front or hooked end of said hookE into a position to be engaged by a projection w which I have securedto the upper arm of the weft-hammer W so that when the said upper armswings forward the hook E and arm 23 are pushed back, rocking the leverT in such a manner as to press the lower end of the lower arm 25 of saidlever against the front of the shipper, throwing said shipper out of thenotch and stopping the loom in the usual manner.

The front end or hook proper e of the tilting hook E is normally held upby a weight 6 on the shank of said hook in the rear of the pivot c. Astop consisting of a bracket 6 secured to the arm t and extending overthe front arm of the hook E carries a screw 6 which thrusts down uponsaid arm and varies the limit of the upward movement of said front arm.

A hunter 6 adjustably held on the rear arm of said fork E by means of aset-screw 6 carries an anti-friction roll 6 against which the fork ostrikes when tilted by the undue tension of the filling thread. Theincreased tension of the filling may be caused by any device arranged inthe filling-carrier and pressing upon or causing a friction upon theturns of the filling which leave the bobbin or cop-tube just before theeX- haustion of said filling. In Fig. 4, I have shown adequate means ofproducing such increased tension by means of the friction of pieces ofcloth 9 secured, as by glue, to the inner faces of the Walls of theshuttle G and pressing upon the mass of filling below the cop proper,said shuttle G being in all respect-s, except as above stated, of theusual construction and operation.

I claim as my invention 1. The combination in a loom, of stopmotiondevices and a controlling device therefor operated by an excessivetension of the filling to stop said loom.

2. The combination in a loom, of stopmotion devices, a Weft-fork, aWeft-hammer, means adapted to be moved into engagement with saidweft-hammer by said Weft-fork upon an excessive tension of the fillingto operate said stop-motion devices, to stop said loom.

In Witness whereof, I have aflixed my signature in presence of twoWitnesses.

ORREN A. SAW YER.

Witnesses:

ALBERT M. MOORE, GRACE CROWLEY.

